Data estimated from available source of information or calculation based on specific assumptions.

R (repetition)

Repetition of data previously reported.

W (wrong unit)

Data for the record is in a unit that does not match the standard dataset unit.

Other explanations

no (number)

Indicates that data unit is number.

t (tonnes =1000 kg)

Indicates that data unit is tonne.

Tip:
when calculating, the program will preserve special values to the fullest extent possible, e.g. the sum of two unknown values is an unknown value, the sum of two negligible values a negligible value. In complex cases, all flags are removed and the result of the calculation is considered a "normal" number.